\(\frac{4}{9}\).\(\frac{13}{3}\)-\(\frac{4}{3}\).\(\frac{40}{9}\)=\(\frac{4.13}{9.3}\)-\(\frac{4.40}{3.9}\)

                                              =\(\frac{\left(4.13\right)-\left(4.40\right)}{9.3}\)

                                              = \(\frac{4\left(13-40\right)}{27}\)

                                              =\(\frac{4\left(-27\right)}{27}\)

                                              =-4

\(\frac{4}{9}\cdot\frac{13}{3}-\frac{4}{3}\cdot\frac{40}{9}\)

\(=\frac{4}{3}\cdot\frac{13}{9}-\frac{4}{3}\cdot\frac{40}{9}\)

\(=\frac{4}{3}\cdot\left(\frac{13}{9}-\frac{40}{9}\right)\)

\(=\frac{4}{3}\cdot-3=-4\)

=4/3 x 1/3 x 13/3 - 4/3 x 40/9

=4/3 x (1/3 x 13/3 - 40/9)

=4/3 x (-3)

=-4

-4/81 nha bạn

đáp án là:

4/9 x (13/3 - 40/3) = 4/9 x (-9) = -4
 

(1-1/2)*(1-1/2)*...(1-100)

1-1/3=2/3

1-1/4=3/4

............................

1-1/100=99/100

=1/2*2/3*3/4*....99/100

(1*2*3*4*....*99)/(2*3*4*...*100)

=1/100

=>1/100

học tốt

Tham khảo ở đây nhé bn: olm.vn/hoi-dap/question/686545.html, mk lm r`

   \(\frac{7}{4}\times\frac{15}{7}+\frac{13}{7}\times\frac{9}{4}-\frac{2}{7}\)

\(=\left(\frac{7}{4}+\frac{9}{4}\right)\times\left(\frac{15}{7}+\frac{13}{7}\right)-\frac{2}{7}\)

\(=4\times4-\frac{2}{7}\)

\(=16-\frac{2}{7}\)

\(=\frac{112}{7}-\frac{2}{7}\)

\(=\frac{110}{7}\)